Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9faac7788229a8…

MALICIOUS

PDF

104.6 KB Created: 2021-09-04 11:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98533c503bdda95207264d16201a2248 SHA-1: a873339745ef7e871d6e6355272227369494ddf3 SHA-256: 9e9faac7788229a8d25750008c2d88615ffbde8a5a93baebeb93a6f3ccc8a561
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, some of which are hosted on compromised WordPress sites. This suggests the PDF is intended to redirect users to malicious websites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ankaser.com/userfiles/file/navixikoxolofokomume.pdf In PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/jaromilunimowek.pdfIn PDF document text
    • https://aokman-drive.com/d/files/65590058116.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/zaliz.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c3aaba85---37241654469.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021083100460673499.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/danixozefezurelazuruvolos.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/837c0b0fd5e4bafab99cb6d35f92be1f/42097958037.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b13bc86d2e---vopapibiluve.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/170ad88bd1f40a1ddca13eed593a81b9/witobuwu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2a077f35a8d7454ffb6d1df213ab9c80/26221916333.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/zidefifikatiwovujujiz.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/fufobazanaj.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/91809648965.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/98445469242.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/vitavujusuvubafinesenuxe.pdfIn PDF document text
    • http://weiddy.com/uploads//files/202108122036285487.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210825034238_6nlkki.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/dajesuwatibedowebufitadox.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c36ae7a7ea8062ae4d415781660e57aa/womosejozot.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/64878797512.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/77592651441.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/85237887977.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/33007285641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sat+writing+grammar+rules+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 21452 bytes
SHA-256: aa793593451704d0b97bc23b7ffb8e8887f1d98c6239326d36245621aa3f50d0
font_01_sfnt_off00016383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16383 10984 bytes
SHA-256: 50f9050a9a8b86dfa33944de2dfe61aad9f3e83cf55ee580a9d749587359102f
font_02_sfnt_off00017cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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